I studied in a top school in Moldova which follows a curriculum whose foundation was defined during the Soviet union times, so could be pretty close to the Russ

I studied in a top school in Moldova which follows a curriculum whose foundation was defined during the Soviet union times, so could be pretty close to the Russian curriculum. Just as an idea, in grade 10-11 I was studying limits, complex numbers, derivatives, grade 12 was dedicated to integrals and solving problems with them. Math got progressively harder starting with grade 5. I remember I was filling about 2-3 notebooks of 48 pages (little squares pattern) per semester with homework and in-class class problem solving. We always had homework to do, and often it would take me hours to come up with a solution to the more difficult problems that would give me a 10 (grade A+). My nephew who finished grade 4 has no homework (Canada), but I remember my grade 4 I had so much homework for each subject (math, French, Romanian, geography, arts, etc). Heck, in grades 1-4 we even had summer homework, which were books containing exercises for various subjects, and I remember that vividly because I hated to do homework in the summer. I'm quite sure that good Russian school are also quite intense..